Grate



(No Model.)

J. A. CORNISH.

GRATE. No. 398,131. Patented Feb. 19, 1889.

WITNESSES. LN'V'EJV'TR UNTTED STATES PATENT OEEIcE.

JOHN A. CORNISH, OF NASHVILLE, ARKANSAS.

GRATE.

SPECIFICATION forming part of Letters Patent No. 398,131, dated February 19, 1889.

Application filed June 27, 1888.

T0 all whom, it may concern:

Be it known that I, JOHN A. CORNISH, of Nashville, in the county of Howard and State of Arkansas, have invented certain new and useful Improvements in Grates; and I do hereby declare that the following is a full, clear, and exact` description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention has relation to improvements in grates for stoves and furnaces.

\ The object of my invention is to produce a grate made in two flanged sections and provided with suitable openings in the ends, body, and outer edges of the flanged portions for the admission of drafts of air through them to the fire-boxes of stoves or furnaces, and also providing the sections with sliding dampers having openings communicating with the openings between the flanges in the body portion of said grate, said sliding dampers being also adapted to close said openings when desired to shut off the draft of air through them.

The invention consists in the novel construction and arrangement of parts, as will be hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a top view of my improved grate, showing the openings of the base-plates communicating with the openings of the sliding dampers. Fig. 2 is a bottom view of the same, showing the openings of the base-plates closed by the sliding dampers; and Fig. 3 is a cross-sec tional view of the grate through the middle. Fig. 4 is a view of one of the perforated sliding dampers. Fig. 5 is a cross-sectional View of same through the end.

Referring to the drawings, the letter A designates the base of my improved grate, made in sections a and b, each section of which is provided with flanges d and d', which extend a suitable distance above the base A. The outer edges of said lianges are provided with V-shaped openings, and when placed side by (No model.)

side, as shown in the drawings, form an arch with diamond openings e, with beveled inner surfaces, while the flanges d form tl-shaped beveled openings.

The sections a and b are provided in their body portions with bell-shaped or downwardly-flaring openings f, which are interposed between t-he diamond and V shaped openings of the flanges d and CZ.

The ends of the sections ct and b, with their flanges d, are also provided with openings g and g, which are made larger than the openings in the body and flanged portions for the purpose of the expulsion of clinlrers, dac. Between the flanges and sliding in suitable bearings on the top portions of the sections c and b are the dampers hand h', having openings le, communicating with the openings f, for the admission of drafts of air to the 1ire-box, said dampers also serving to close the openingsf, when. necessary. The ends of these dampers are provided with Il-shaped cuts or openings Z, which mesh with the openings in the ends of the sections a and b when the draft is cut off from the openings f of said sections.

On the under side of the sections a and b I provide the edges thereof with longitudinal curved strengthening bars or ribs m, which allow a suitable space between them for the passage of air to the openings fand for the expulsion of ashes, dto., from the fire-box. It willbe observed that said bars are thus curved so as to extend considerably below the bottom of grate in the center, as shown in Fig. 3, and at the ends they run to a flat point so as scarcely to be perceptible, as shown in Fig. 5. The bars m being thus constructed, the ends thereof rest upon the shoulders of the ashbox and the middle portions extend down therein for the purpose aforementioned.

I attach importance to the fact that in the construction and arrangement of my grate the openings at the ends and in the outer edges of the flanged portions of the sections allow the entering of drafts of air to the lireboXes of stoves and furnaces in a uniform degree. These openings also provide for the 'egress of ashes from thel fire-boxes. I also attach importance to the construction and arrangement of my dampers, which slide on the top'portions of the sections a and b', and provided wi-th openings which communicate with the openings of said sections, whereby said dampers also serve to cut oft the flow of draft therefrom by the closing of said openings by the sliding' dampers.

Another valuable feature of my grate is that it is made in sections.

It is well known that the grates of stoves or furnaces need renewing much more frequently than any other portion. ceive the full force of the iire, they burn out and become warped in places, so as to destroy their efficiency comparatively quicker than any other portion thereof, thus necessitating a new grate. My invention obviates this difficulty. Any section of my grate becoming warped or destroyed by fire can be taken out and renewed at pleasure'. Again, when fire is not needed to any great extent, it can be started only in one or as many sections as are required.

It will be observed that my grate has openings only in the body and flanged portions. I am aware that gratos have been constructed somewhat upon the same principle as mine, with openings in the bottom, sides, and flanged portions. Such grates I do not claim, as my grate has an advantage over said grates in this respect: the body portion of my grate can be iilled with fuel, and when ignited it will burn but slowly, as there is no direct draft, save the one in the body portion, for the admission of air, which can' be effectually cut off by the damper K at any time. This feature of my invention will enable a very slow fire to be kept. When more lire is needed, the grate is filled sufficiently with coal, so as to cover the openings in the flanged portions. This will occasion a direct and uniform draft at every point in the grate. The gratos constructed with openings in body, sides, and flanged portions are more specially adapted to furnaces where a powerful fire is needed, while my grate is more particularly adapted to stoves where it is necessary to regulate the fire and keep itat any temperature desired. The openings of the two sections and the openings of the dampers also allow for the passage of the ashes, &c., from the 'Firebox to the ash-pit.

The damper is operated by means of any suitable poker, which is bent at a slight right angle at one end.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

The base A, having the openings f, the bars ym, and the solid flanges d and d', said flanges havin g openings only in the outer edges thereof, in combination with the sliding damper h, provided with openings communicating with the openings f', and adapted to close the same, substantially as described, and for the purpose set forth.

In testimonythat I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

J. A. CORNISH.

Witnesses:

E. W. McCRAnY. A. L. BLACK. 

